DevOps Troubleshooting: Linux Server Best Practices by Kyle Rankin

By Kyle Rankin

“If you’re a developer attempting to work out why your program isn't responding at three am, you would like this publication! this is often now my go-to e-book whilst diagnosing creation concerns. It has kept me hours in troubleshooting complex operations problems.”

Trotter Cashion, cofounder, Mashion

 

DevOps may help builders, QAs, and admins interact to resolve Linux server difficulties way more quickly, considerably enhancing IT functionality, availability, and potency. to achieve those merits, even though, workforce individuals desire universal troubleshooting abilities and practices.

 

In DevOps Troubleshooting: Linux Server top Practices , award-winning Linux specialist Kyle Rankin brings jointly the entire standardized, repeatable thoughts your group must cease finger-pointing, collaborate successfully, and speedy clear up almost any Linux server challenge. Rankin walks you thru utilizing DevOps ideas to troubleshoot every little thing from boot mess ups and corrupt disks to misplaced e mail and downed web content. You’ll grasp vital talents for diagnosing high-load platforms and community difficulties in construction environments.

 

Rankin exhibits how to

  • Master DevOps’ method of troubleshooting and confirmed Linux server problem-solving principles
  • Diagnose gradual servers and functions through opting for CPU, RAM, and Disk I/O bottlenecks
  • Understand fit boots, so that you can determine failure issues and connect them
  • Solve complete or corrupt disk matters that hinder disk writes
  • Track down the resources of community problems
  • Troubleshoot DNS, electronic mail, and different community services
  • Isolate and diagnose Apache and Nginx internet server disasters and slowdowns
  • Solve issues of MySQL and Postgres database servers and queries
  • Identify failures–even notoriously elusive intermittent failures

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Sample text

When you type top on the command line and press Enter, you will see a lot of system information all at once (Figure 2-1). This data will continually update so that you see live information on the system, including how long the system has been up, the load average, how many total processes are running on the system, how much memory you have—total, used, and free—and finally a list of processes on the system and how many resources they are using. You probably won’t be able to see every process that is currently running on your system with top because they wouldn’t all fit on the Diagnose Load Problems with top 21 Figure 2-1 Standard top output screen.

In the end, even if you do find someone to blame, you may not have found the actual root cause. This fosters an even more dysfunctional environment when you have to troubleshoot a new issue. ” Finally, some people love postmortems so much that they start them before the problem is even solved. When you are in the middle of a crisis, your focus should be strictly on the problem at hand and the troubleshooting steps you will perform to isolate it. ” If you’ve ever solved complex problems, you know that what you think might be the root cause can change multiple times throughout the process.

On a normal Linux server this will be the GRUB program, although in the past a different program called LILO was also used. GRUB is normally what is used when you boot from a hard drive, while systems that boot from USB, CD-ROM, or the network might use syslinux, isolinux, or pxelinux respectively as their boot loader instead of GRUB. Although the specifics of syslinux and other boot loaders are different from GRUB, they all essentially load some sort of software and read a configuration file that tells them what operating systems they can boot, where to find their respective kernels, and what settings to give the system as it boots.

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